Asample of wood that originally contained 100 frames of carbon-14 (half life = 5,568 years) now only contains 25 grams of carbon-14. approximately how many years ago was this sample part of a living tree

The answer to your problem is: 11136 years

Explanation:

Data

Original amount of carbon-14: 100 frames

half life of carbon-14 = 5,568 years

Only contains 25 grams of carbon-14

Question: how many years ago was this carbon-14 part of a tree.

Process

         100 grames of carbon-14        

          50 grames of carbon-14      one half life

          25 grames of carbon-14       one half life

                                 Total              two half-lifes

            1 half-life 5568 years

            2 half -lifes    x

x = 2x5568 / 1 = 11136 years

14 days is the half-life of phosphorus-32